yppasswdd_main.c revision 59750 
1/*
2 * Copyright (c) 1995, 1996
3 *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by Bill Paul.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/rpc.yppasswdd/yppasswdd_main.c 59750 2000-04-29 12:47:03Z asmodai $";
36#endif /* not lint */
37
38#include "yppasswd.h"
39#include <stdio.h>
40#include <sys/types.h>
41#include <stdlib.h> /* getenv, exit */
42#include <unistd.h>
43#include <string.h>
44#include <sys/param.h>
45#include <rpc/pmap_clnt.h> /* for pmap_unset */
46#include <string.h> /* strcmp */
47#include <signal.h>
48#include <fcntl.h>
49#include <sys/ioctl.h>
50#include <sys/stat.h>
51#ifdef __cplusplus
52#include <sysent.h> /* getdtablesize, open */
53#endif /* __cplusplus */
54#include <memory.h>
55#include <sys/socket.h>
56#include <netinet/in.h>
57#include <syslog.h>
58#include <err.h>
59#include <errno.h>
60#include <rpcsvc/yp.h>
61struct dom_binding {};
62#include <rpcsvc/ypclnt.h>
63#include "yppasswdd_extern.h"
64#include "yppasswd_private.h"
65#include "ypxfr_extern.h"
66
67#ifndef SIG_PF
68#define	SIG_PF void(*)(int)
69#endif
70
71#ifdef DEBUG
72#define	RPC_SVC_FG
73#endif
74
75#define	_RPCSVC_CLOSEDOWN 120
76int _rpcpmstart = 0;		/* Started by a port monitor ? */
77static int _rpcfdtype;
78		 /* Whether Stream or Datagram ? */
79	/* States a server can be in wrt request */
80
81#define	_IDLE 0
82#define	_SERVED 1
83#define	_SERVING 2
84
85extern int _rpcsvcstate;	 /* Set when a request is serviced */
86char *progname = "rpc.yppasswdd";
87char *yp_dir = _PATH_YP;
88char *passfile_default = _PATH_YP "master.passwd";
89char *passfile;
90char *yppasswd_domain = NULL;
91int no_chsh = 0;
92int no_chfn = 0;
93int allow_additions = 0;
94int multidomain = 0;
95int verbose = 0;
96int resvport = 1;
97int inplace = 0;
98char *sockname = YP_SOCKNAME;
99
100static void terminate(sig)
101	int sig;
102{
103	svc_unregister(YPPASSWDPROG, YPPASSWDVERS);
104	svc_unregister(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
105	unlink(sockname);
106	exit(0);
107}
108
109static void reload(sig)
110	int sig;
111{
112	load_securenets();
113}
114
115static void
116closedown(int sig)
117{
118	if (_rpcsvcstate == _IDLE) {
119		extern fd_set svc_fdset;
120		static int size;
121		int i, openfd;
122
123		if (_rpcfdtype == SOCK_DGRAM) {
124			unlink(sockname);
125			exit(0);
126		}
127		if (size == 0) {
128			size = getdtablesize();
129		}
130		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
131			if (FD_ISSET(i, &svc_fdset))
132				openfd++;
133		if (openfd <= 1) {
134			unlink(sockname);
135			exit(0);
136		}
137	}
138	if (_rpcsvcstate == _SERVED)
139		_rpcsvcstate = _IDLE;
140
141	(void) signal(SIGALRM, (SIG_PF) closedown);
142	(void) alarm(_RPCSVC_CLOSEDOWN/2);
143}
144
145static void usage()
146{
147	fprintf(stderr, "%s\n%s\n",
148"usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
149"                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
150	exit(1);
151}
152
153int
154main(argc, argv)
155	int argc;
156	char *argv[];
157{
158	register SVCXPRT *transp = NULL;
159	int sock;
160	int proto = 0;
161	struct sockaddr_in saddr;
162	int asize = sizeof (saddr);
163	int ch;
164	char *mastername;
165	char myname[MAXHOSTNAMELEN + 2];
166	extern int debug;
167
168	debug = 1;
169
170	while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
171		switch(ch) {
172		case 't':
173			passfile_default = optarg;
174			break;
175		case 'd':
176			yppasswd_domain = optarg;
177			break;
178		case 's':
179			no_chsh++;
180			break;
181		case 'f':
182			no_chfn++;
183			break;
184		case 'p':
185			yp_dir = optarg;
186			break;
187		case 'a':
188			allow_additions++;
189			break;
190		case 'm':
191			multidomain++;
192			break;
193		case 'i':
194			inplace++;
195			break;
196		case 'v':
197			verbose++;
198			break;
199		case 'u':
200			resvport = 0;
201			break;
202		default:
203		case 'h':
204			usage();
205			break;
206		}
207	}
208
209	if (yppasswd_domain == NULL) {
210		if (yp_get_default_domain(&yppasswd_domain)) {
211			yp_error("no domain specified and system domain \
212name isn't set -- aborting");
213		usage();
214		}
215	}
216
217	load_securenets();
218
219	if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
220		yp_error("no ypserv processes registered with local portmap");
221		yp_error("this host is not an NIS server -- aborting");
222		exit(1);
223	}
224
225	if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
226						"localhost",0)) == NULL) {
227		yp_error("can't get name of NIS master server for domain %s",
228			 				yppasswd_domain);
229		exit(1);
230	}
231
232	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
233		yp_error("can't get local hostname: %s", strerror(errno));
234		exit(1);
235	}
236
237	if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
238		yp_error("master of %s is %s, but we are %s",
239			"passwd.byname", mastername, myname);
240		yp_error("this host is not the NIS master server for \
241the %s domain -- aborting", yppasswd_domain);
242		exit(1);
243	}
244
245	debug = 0;
246
247	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
248		int ssize = sizeof (int);
249
250		if (saddr.sin_family != AF_INET)
251			exit(1);
252		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
253				(char *)&_rpcfdtype, &ssize) == -1)
254			exit(1);
255		sock = 0;
256		_rpcpmstart = 1;
257		proto = 0;
258		openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
259	} else {
260		if (!debug) {
261			if (daemon(0,0)) {
262				err(1,"cannot fork");
263			}
264		}
265		openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
266		sock = RPC_ANYSOCK;
267		(void) pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
268		(void) pmap_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
269		unlink(sockname);
270	}
271
272	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
273		transp = svcudp_create(sock);
274		if (transp == NULL) {
275			yp_error("cannot create udp service.");
276			exit(1);
277		}
278		if (!_rpcpmstart)
279			proto = IPPROTO_UDP;
280		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
281			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp).");
282			exit(1);
283		}
284	}
285
286	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
287		transp = svctcp_create(sock, 0, 0);
288		if (transp == NULL) {
289			yp_error("cannot create tcp service.");
290			exit(1);
291		}
292		if (!_rpcpmstart)
293			proto = IPPROTO_TCP;
294		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
295			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp).");
296			exit(1);
297		}
298	}
299
300	unlink(sockname);
301	transp = svcunix_create(sock, 0, 0, sockname);
302	if (transp == NULL) {
303		yp_error("cannot create AF_LOCAL service.");
304		exit(1);
305	}
306	if (!svc_register(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, master_yppasswdprog_1, 0)) {
307		yp_error("unable to register (MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, unix).");
308		exit(1);
309	}
310	/* Only root may connect() to the AF_UNIX link. */
311	if (chmod(sockname, 0))
312		err(1, "chmod of %s failed", sockname);
313
314	if (transp == (SVCXPRT *)NULL) {
315		yp_error("could not create a handle");
316		exit(1);
317	}
318	if (_rpcpmstart) {
319		(void) signal(SIGALRM, (SIG_PF) closedown);
320		(void) alarm(_RPCSVC_CLOSEDOWN/2);
321	}
322	/* set up resource limits and block signals */
323	pw_init();
324
325	/* except SIGCHLD, which we need to catch */
326	install_reaper(1);
327	signal(SIGTERM, (SIG_PF) terminate);
328
329	signal(SIGHUP, (SIG_PF) reload);
330
331	svc_run();
332	yp_error("svc_run returned");
333	exit(1);
334	/* NOTREACHED */
335}
336